olf 
Jas 
mi 
a 
pea ee 
ee 
20} —+ hf $ 
EE ———EEE7= 
ee eee ee 
2 po Zadar 
Bey (nS | NG a 
4566205 8 1.36 1/780 el 24- 
Percenr 11g 0 
Fig. 25. Dyckerhoff’s experiments on magnesia, showing tensile strength of high 
magnesia cements deteriorating with age. 
